Download PDF by American Society of Heating: 2008 ASHRAE Handbook - Heating, Ventilating, and
By American Society of Heating
The 2008 ASHRAE guide - HVAC platforms and kit discusses a number of platforms and the gear (components or assemblies) that include them, and describes good points and modifications. this knowledge is helping method designers and operators in deciding upon and utilizing apparatus. it's divided into seven sections:
- Air-Conditioning and Heating structures
- Air-Handling apparatus and elements
- Heating gear and elements
- Cooling gear and parts
- General parts
- Packaged, Unitary and Split-System apparatus
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Additional resources for 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
Most energy codes require that the supply duct be insulated, which is usually good practice regardless of code requirements. Uninsulated supply ducts delivering cool air are subject to condensation formation, leading to building water damage and potential mold growth, depending on the dew-point temperature of surrounding air. • Controlling humidity in a space can affect the air quantity and become the controlling factor in selecting supply airflow rate. VAV systems provide only limited humidity control, so if humidity is critical, extra care must be taken in design.
VAV reheat can ensure close room space pressure control with the supply terminal functioning in sync with associated room exhaust. , 100 fpm at sash in occupied periods and 60 fpm in unoccupied periods). Dual-Conduit. This method is an extension of the single-duct VAV system: one supply duct offsets exterior transmission cooling or heating loads by its terminal unit with or without auxiliary heat, and the other supply air path provides cooling throughout the year. The Variable-Air-Volume System with Reheat and Induction and Fan-Powered Devices Fig.
In large systems (over 50,000 cfm), air-handling equipment is usually custom-designed and fabricated to suit a particular application. Air handlers may be either centrally or remotely located. , a “50 ton unit” or a “40,000 cfm unit”) that adequately describes the desired product. Regardless of size or type, the designer must properly determine an air-handling unit’s required supply air temperature and volume; outside air requirements; desired space pressures; heating and cooling coil capacities; humidification and dehumidification capacities; return, relief, and exhaust air volume requirements; and required pressure capabilities of the fan(s).
2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by American Society of Heating